Electric device



10s CCMPOSITIONS, Gregg R f i f NER comma OB PLAT16 Nov. 12, 1935. Q 50L E A 2,020,718

ELECTRIC DEVICE Filed Sept. 28, 1934 8 i] 7 2 Mn 1 I lNVENTORS BY A ORNEY Patented Nov. 12, 1935 UNITED STATES PATENT OFFIE acen 2O ple) of the above differ ure into desired shape, in practice when making artiby pressing the mixt accordance with the cles of synthetic resins, from the lamp ca The object of 30 tric lamp device tion is to provi such a base for 3 steps of first forming electrically insulating material generally in plastics, such as um cement burned brick m 45 desired shape an Q body with a d then at the part of the base lamp does not reduce th the base below the stre the lamp and that the 55 from the direct heat fr olestr,

hardenin resin, su nhenobformalaehyde; the condensates of urea-formal ehyde or thio Lvgta s, or s e ac. I ave emonstrated t 50 e dissociation, if any, of the organic material ELECTRIC Cornelis B01 and Adrianus Netherlands, assignors Company,

In the DEVICE Linnemans, Eindhoven, to General Electric a corporation of New York Application September 28, Netherlands 1934, Serial No.

746,003 October 4, 1933 i 4 Claims. (Cl. 176-122) t the electrical contacts parts of the base, being ent materials and formed are unsuitable as the heat Still further obpparent from the hereof. I

jects the new and d body of heat rewith a hardening hod comprises the of heat-resisting, of the type used asbestos cement, or c amot e, n na ing the formed ch as the products a mass impreg urea form 1 de;

hat

heated intensively by the e mechanical strength of ngth required to support organic material shielded cm the lamp, particularly the base whereat the electrited, does not dissociate adjacent the part of cal contacts are moun during the operation 0 ng material adjacent said contacts and this prevents electrical leakage between said contacts.

Bases havin by the ab g the above "structure and made particularly useful in panying and forming a gaseous electric disaving a ba Fig. 1 is a front elevational view of the lamp device, the base thereof being shown in section, and

Fig. 2 is a sectional vi 2-2 of Fig. 1.

Like numbers figures.

Referring to the drawing the gaseous electric discharge lamp device comprises a U-shaped container having a stem 2 at each end thereof and a thermioni ew thereof along the line denote like parts 'in both the of sodium vapor.

A base 5 having two cylindric therein to accomin container l is mo base 5 is fastene al depressions 6 and 8 of the tainer l.

exsaid container I lamp. Said base thereon each of the electrodes 3. ype though it will 56 pansion and contraction of under service co cted to one of The base 5 is of the bayonet t be understood, of course, that said base I is pro- What we claim as new and desire to secure by vided with screw threads, when desired. The Letters Patent 01 the United States is: electrodes 3 are heated by the discharge al- 1. A new article of manufacture comprising 8.

though, when desired, the number of contacts I moisture proof formed body of asbestos, cement is increased and a separate heating current is and talc whose pores are filled with a hardening 5 resin used to heat said electrodes 3.

The base 5 is made as follows: a mixture of one 2. combination, an electric discharge depart asbestos, one part of cement and two parts avice of a type which is adapted to operate at an talcum s moistened with water and pressed into elevated temperature, and an insulating base the desired shape. Them for an appreciable time, preferably four or five cement and talc whose pores are filled with a days, and is then heated to a temperature of hardening resin. y i

300,C. to dry it thoroughly. The article in its 3. A method of manufacturing an electrically md ionditlon is then immersed for approxiinsulating, heat resisting, moisture proof article mately 12 hours in an approximately sglu; which comprises the steps of forming a mass of 15 tion ofacondensate ofa henol-forma e cement, asbestos and talc, drying the formed alcohol. 'I'He'ifiicle after fipregnation, or satuarticle, immersing said formed article in a bath m 0 is then rinsed superficially with alcohol comprising a moisture proof hardening resin to and placed inaiurnace wherein the temperature fill the pores in said article, and then baking is raised gradually to, ,C'. This heating said article. period is about one and one-Half hours. The 4. A method of manufacturing an electrically furnace is then allowed to cool and when cooled insulating, heat resisting, moisture proof base for the finished article is removed therefrom. electric lamp devices which comprises the steps While we have shown and described and have of mixing one part of asbestos and one part of pointed out in the annexed claims certain novel cement with two parts talcum, moistening this 25 features of the invention, it will be understood mixture with water, pressing the mass into dethat various omissions,'substitutions and changes sired shape, drying the shaped article, immersin the forms and details of the device illustrated ing the article in a solution of a condensate of article is dried therefor which comprises a body of asbestos, 10 

